zip description added

frontend/src/app/folder-upload/folder-upload.component.html

@@ -20,8 +20,9 @@ <h1 class="display-3">MLaaS for Researchers</h1>
     <div class="row">
       <div class="col-12 col-md-6">
         <h2>Train your model</h2>
-        <p>Simply upload your images as a compressed folder. Once done, click "Start Training" to begin the training
-          process. Wait until a pop-up message appears, indicating that the training process is finished, so that you can start serving your model.</p>
+        <p>Simply upload your images as a compressed zip folder, with the images organized into subfolders by class. The subfolder names will be used later for classification results, so choose them wisely! <br>
+          Once done, click "Start Training" to begin the process. Wait for a pop-up message indicating that the training is finished, and then you can start serving your model.
+        </p>
 
         <!-- File Upload Button -->
         <div class="input-group mb-3">